Throughout the Pern books, the dangers of going between too low, or going between on the ground are constantly reiterated. What do you think would happen if someone did? Would they take a piece of the ground with them?

I know Nuella went between on Kisk in Dragon's Kin. That was on the ground, I think-- nothing amiss happened there. Although that was a watch-wher, not a dragon, so it's a different case.

Or accidentally taking some of the ground with you. Plus in Moreta Holth's takeoffs were getting shallower and her leaps between faster and barely off the ground, which in part lead to a tired Moreta not having time to think of clear coordinates and their being lost between. Taking time and planning your jumps is emphasized in Weyrling training because rushing a jump can get you killed.